76 TRANSACTION"? OF THE [FEB. 23, 



of North American Rodentia." While the two authors shared 

 the hibor about equally, the joiat authorship implied iu the 

 title relates merely to the fact that their separate memoirs 

 are bound together under one general title, the different mono- 

 graphs being each by a single author. The work consists of 

 eleven separate and distinct memoirs. In two cases, as in the 

 monographs of the squirrels and hares, the scope is greater 

 than is indicated by the general title of the work, all of the 

 species found in Mexico, South and Central America, being 

 included, as well as those from North America. An important 

 feature of this work is the bibliographical appendix, by Gill 

 and Coues, consisting of about 130 pages, and bringing the 

 bibliography of North American mammals down to the year 

 1874, in a very thorough manner, and including most of the 

 titles down to as late as 1876.^ 



In 1880 I published an octavo volume of about 800 pages, with 

 numerous illustrations in the text, entitled '' History of North 

 American Pinnipeds : a Monograph of the Walruses, Sea- Lions, 

 Sea-Jiears, and Seals of North America," treating the subject 

 at length in all its bearings. 



In addition to the special works already enumerated, number- 

 less papers, some of them of great importance, have ajipeared in 

 Government reports and in the transactions of scientific societies. 

 Some of these are simply more or less fully annotated faunal 

 lists ; others are faunal lists, including incidentally much tech- 

 nical matter ; others are more or less elaborate monographs of 

 particular genera or families; others still are brief papers de- 

 scribing new species or recording rare ones. Baird published 

 practically nothing on mammals after 1859, since wliich time 

 the most prominent names in the field have been Harrison 

 Allen, J. A. Allen, Caton, Cooper, Cope, Coues, Dall, Gill, 

 Kennicott, Mearns, Merriam, Scammon, and True. 



Besides these, Alston, of England, has published on the 

 mammals of Mexico, in Godman and Salvin^s " Biologia Centrali- 

 Americana" ; De Saussure has also written important papers on 

 the same subject; while Brown and Ross have published valu- 

 able memoirs on the mammals of Arctic America. 



' The titles of works and papers briefly mentioned in the present 

 paper will be found there given in full. The intended scope of the 

 work was to include "(a) all works and papers on mammalia at large 

 published in North America, (b) all works and papers, wherever pub- 

 lished, relating to North American mammals, and (c) such general 

 works or collateral special papers as bear more or less directly upon 

 the subject." The titles are arranged chronologically under a few 

 general heads. Though not put forth as absolutely complete, it still 

 remains the most extended compilation on the subject yet published. 



